:root {
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #0b0d10;
  color: #f3f4f6;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top, #171b22 0, #0b0d10 48%, #070809 100%);
}

.shell {
  width: min(920px, calc(100% - 32px));
  min-height: 100vh;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
}

.header {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #262a31;
}

.brand {
  font-size: 20px;
  font-weight: 750;
  letter-spacing: .08em;
}

.status {
  color: #a7adb8;
  font-size: 13px;
  display: flex;
  gap: 8px;
  align-items: center;
}

.status span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #57c785;
}

.welcome {
  flex: 1;
  min-height: 480px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.mark {
  width: 58px;
  height: 58px;
  border: 1px solid #3a404b;
  border-radius: 18px;
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 25px;
  margin-bottom: 24px;
}

h1 {
  margin: 0;
  font-size: clamp(32px, 6vw, 52px);
  letter-spacing: -.04em;
}

.welcome p {
  margin: 14px 0 0;
  color: #9299a5;
}

.composer {
  display: flex;
  gap: 10px;
  padding: 12px;
  border: 1px solid #343944;
  background: #111419;
  border-radius: 18px;
  box-shadow: 0 14px 50px rgba(0,0,0,.25);
}

textarea {
  flex: 1;
  resize: none;
  border: 0;
  outline: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  padding: 10px 8px;
  min-height: 42px;
}

button {
  width: 42px;
  height: 42px;
  border: 0;
  border-radius: 12px;
  background: #f3f4f6;
  color: #0b0d10;
  font-size: 18px;
  cursor: pointer;
}

button:hover { opacity: .88; }

.prototype {
  text-align: center;
  color: #666d78;
  font-size: 11px;
  margin: 12px 0 22px;
}